Flagged Revisions installed. Unapproved pages display a Red unchecked notice under the title. Trolls attack here by creating and archiving pages with offensive content. To verify an archived page, check the original URL. Questions about administration? Contact User talk:Abd. Limited privacy on this site, see CFC:Limited privacy

Sudoku/Reviews/Systematic Sudoku/Nakex83

From CFC
< Sudoku‎ | Reviews‎ | Systematic Sudoku
Jump to: navigation, search

This puzzle came from sysudoku.com.

A Nakex 83 BARN Storming Finish Raw puzzle in SW Solver

Solution with Simultaneous Bivalue Nishio

First coloring

Some seed pairs with lower Gordonian cell number were examined and rejected. r5c5={36} looked better and some time was spent with it. A mutual resolution was found, but the coloring was then abandoned as not easily generating more results.
SBN on r5c5={36}

SBN coloring

  • light orange cell: seed cell for chaining
  • green: first chain. Convention: lowest digit or Gordonian cell number.
light green: alternate cell candidate within green chain.
  • red: alternate chain.
light red: alternate cell candidate within red chain.
  • purple: mutual elimination.
  • light purple cell: contradiction (multiple in region or empty in color)
  • light blue cell: mutual resolution (as only colored candidate in cell)

Second coloring

The next seed pair was r2c3={34}. This found a contradiction in the 4 chain, hence r2c3=3, and consequences.

SBN on r2c3={34}

Third coloring:

r5c2={75}. Contradiction found in the 5 pair, so r5c2=7. Easy to the end.

SBN on r5c2={75}